Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

A303795

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =12a(2) =17a(3) =30a(4) =70a(5) =121a(6) =221a(7) =421a(8) =800a(9) =1511a(10) =2832a(11) =5340a(12) =10089a(13) =19009a(14) =35825a(15) =67558a(16) =127375a(17) =240150a(18) =452774a(19) =853653a(20) =1609501a(21) =3034561a(22) =5721352a(23) =10787091a(24) =20338064a(25) =38345504a(26) =72296881a(27) =136309037a(28) =256998009a(29) =484545858

External references